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Originally posted by Sean_Goddard
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Ivconic, I dont think the design will work at all 
Sorry..Well not as it is, Here's what I think is wrong.....
Look at the Whites Classic 3, it has THREE channels. You have two. What you have done is a discriminate with no reference point against which to discriminate.
You have wire OR'ed the outout from the final stages of the filter system, but you need to OR these further with another Ground referenced channel as per the Classic 3.
I may be wrong, but that is what I suspect is causing your problem.
Sorry..Well not as it is, Here's what I think is wrong.....Look at the Whites Classic 3, it has THREE channels. You have two. What you have done is a discriminate with no reference point against which to discriminate.
You have wire OR'ed the outout from the final stages of the filter system, but you need to OR these further with another Ground referenced channel as per the Classic 3.
I may be wrong, but that is what I suspect is causing your problem.
Not successfull, already tested and showed...
My mind is somewhere other now. I will return to this later...
Idea is to make as simple as possiblle 2 tone detector.
There was some Bounty Hunter Tracker 505/I as i recall. Pretty cheap and not so deep, but it has that feature.
Recently i saw same feature on Black Knight.
Damn...i sold both already! I can not trace them any more...to see how is soluted there.
BTW... might be that you have schematic from Tracker 505/I ?
Not worth of reproducing it, but good to see solution and try to apply on TGSL..maybe..
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